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Learn MoreCytoplasmic RNA granules have emerged as important elements of posttranscriptional and translational regulation. Stress, germinal and neuronal granules contain RNA-binding proteins capable of self-assembly due to prion-like domains. Hyperassembly mediated by these prion-like domains causes several neurodegenerative diseases. Here, we report a subset of the mammalian prion protein (PrP), also prone to self-assembly, propagation and to cause devastating diseases, is a component of naturally occurring messenger ribonucleoproteins (mRNPs) in adult mouse brains. Biomolecules co-purified with PrP revealed a multitude of diverse RNA granule associated proteins and mRNAs encoding members of the translation machinery, indicating a role in a specialized translation process. Importantly, PrP mutations linked to Creutzfeldt-Jakob disease (CJD) or fatal familial insomnia (FFI) severely impaired recovery of mRNPs from preclinical mice, possibly representing a very early pathological process. Thus, mutant PrP may cause dysfunction in RNA regulation, thereby joining the constantly expanding ranks of disease associated RNP granule proteins.; The file Enrichment_analysis.xlsx contains mRNAs (FDR < 0.01) co-purified with PrP in both WT sample pools as identified by DESeq2 and the respective gene counts and log2 fold changes for CJD and FFI PrP:IP sample pools. SOURCE: Clemens Krost (clemenskrost@gmx.de) - AG Jackson German Center for Neurodegenerative Diseases (DZNE)
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